import type { NpcChatTurnDirective } from '../../packages/shared/src/contracts/rpgRuntimeChat';
import type {
  CustomWorldProfile,
  GameState,
  SceneActBlueprint,
  SceneActRuntimeState,
  SceneChapterBlueprint,
  SceneConnectionInfo,
  StoryEngineMemoryState,
} from '../types';
import { resolveCustomWorldRoleIdReferences } from './customWorldRoleReferences';

function toSet(values: string[]) {
  return new Set(values.map((value) => value.trim()).filter(Boolean));
}

function resolveCustomWorldRuntimeSceneAliases(
  profile: CustomWorldProfile,
  sceneId: string,
) {
  const aliases = toSet([sceneId]);
  const campId = profile.camp?.id?.trim() || 'custom-scene-camp';
  if (sceneId === 'custom-scene-camp' || sceneId === campId) {
    aliases.add(campId);
    aliases.add('custom-scene-camp');
  }

  // 中文注释：部分单元测试和旧快照会传入精简 profile，运行态解析不能假设 landmarks 始终存在。
  (profile.landmarks ?? []).forEach((landmark, index) => {
    const runtimeSceneId = `custom-scene-landmark-${index + 1}`;
    if (sceneId === runtimeSceneId || sceneId === landmark.id) {
      aliases.add(runtimeSceneId);
      aliases.add(landmark.id);
    }
  });

  return aliases;
}

function doesSceneMatchChapter(
  profile: CustomWorldProfile,
  sceneId: string,
  chapter: SceneChapterBlueprint,
) {
  const sceneAliases = resolveCustomWorldRuntimeSceneAliases(profile, sceneId);
  const chapterSceneIds = toSet([
    chapter.sceneId,
    ...(chapter.linkedLandmarkIds ?? []),
    ...(chapter.acts ?? []).map((act) => act.sceneId),
  ]);

  return [...sceneAliases].some((id) => chapterSceneIds.has(id));
}

export function resolveSceneChapterBlueprint(
  profile: CustomWorldProfile | null | undefined,
  sceneId: string | null | undefined,
): SceneChapterBlueprint | null {
  if (!profile || !sceneId) {
    return null;
  }

  return (
    profile.sceneChapterBlueprints?.find((entry) =>
      doesSceneMatchChapter(profile, sceneId, entry),
    ) ?? null
  );
}

export function resolveActiveSceneActBlueprint(params: {
  profile: CustomWorldProfile | null | undefined;
  sceneId: string | null | undefined;
  storyEngineMemory?: StoryEngineMemoryState | null;
}): SceneActBlueprint | null {
  const runtimeState = params.storyEngineMemory?.currentSceneActState;
  const runtimeChapter =
    params.profile && runtimeState?.chapterId
      ? params.profile.sceneChapterBlueprints?.find(
          (entry) =>
            entry.id === runtimeState.chapterId &&
            Boolean(params.sceneId) &&
            doesSceneMatchChapter(params.profile!, params.sceneId!, entry),
        ) ?? null
      : null;
  const chapter =
    runtimeChapter ?? resolveSceneChapterBlueprint(params.profile, params.sceneId);
  if (!chapter || chapter.acts.length === 0) {
    return null;
  }

  if (
    runtimeState &&
    runtimeState.chapterId === chapter.id
  ) {
    const matchedAct = chapter.acts.find((entry) => entry.id === runtimeState.currentActId);
    if (matchedAct) {
      return matchedAct;
    }
  }

  return chapter.acts[0] ?? null;
}

export function resolveSceneActProgression(params: {
  profile: CustomWorldProfile | null | undefined;
  sceneId: string | null | undefined;
  storyEngineMemory?: StoryEngineMemoryState | null;
}): {
  chapter: SceneChapterBlueprint;
  runtimeState: SceneActRuntimeState;
  activeAct: SceneActBlueprint;
  nextAct: SceneActBlueprint | null;
  isLastAct: boolean;
} | null {
  const chapter = resolveSceneChapterBlueprint(params.profile, params.sceneId);
  if (!chapter || chapter.acts.length === 0) {
    return null;
  }

  const runtimeState = buildInitialSceneActRuntimeState(params);
  if (!runtimeState) {
    return null;
  }

  const activeActIndex = chapter.acts.findIndex(
    (entry) => entry.id === runtimeState.currentActId,
  );
  const resolvedActIndex =
    activeActIndex >= 0
      ? activeActIndex
      : Math.min(
          Math.max(runtimeState.currentActIndex, 0),
          chapter.acts.length - 1,
        );
  const activeAct = chapter.acts[resolvedActIndex] ?? chapter.acts[0]!;
  const nextAct = chapter.acts[resolvedActIndex + 1] ?? null;

  return {
    chapter,
    runtimeState: {
      ...runtimeState,
      currentActId: activeAct.id,
      currentActIndex: resolvedActIndex,
    },
    activeAct,
    nextAct,
    isLastAct: !nextAct,
  };
}

export function advanceSceneActRuntimeState(params: {
  progress: NonNullable<ReturnType<typeof resolveSceneActProgression>>;
}): SceneActRuntimeState | null {
  const { progress } = params;
  if (!progress.nextAct) {
    return null;
  }

  const completedActIds = toSet([
    ...(progress.runtimeState.completedActIds ?? []),
    progress.activeAct.id,
  ]);
  const visitedActIds = toSet([
    ...(progress.runtimeState.visitedActIds ?? []),
    progress.nextAct.id,
  ]);

  return {
    sceneId: progress.chapter.sceneId,
    chapterId: progress.chapter.id,
    currentActId: progress.nextAct.id,
    currentActIndex: progress.runtimeState.currentActIndex + 1,
    completedActIds: [...completedActIds],
    visitedActIds: [...visitedActIds],
  };
}

export function buildInitialSceneActRuntimeState(params: {
  profile: CustomWorldProfile | null | undefined;
  sceneId: string | null | undefined;
  storyEngineMemory?: StoryEngineMemoryState | null;
}): SceneActRuntimeState | null {
  const runtimeState = params.storyEngineMemory?.currentSceneActState;
  const runtimeChapter =
    params.profile && params.sceneId && runtimeState?.chapterId
      ? params.profile.sceneChapterBlueprints?.find(
          (entry) =>
            entry.id === runtimeState.chapterId &&
            doesSceneMatchChapter(params.profile!, params.sceneId!, entry),
        ) ?? null
      : null;
  const chapter =
    runtimeChapter ?? resolveSceneChapterBlueprint(params.profile, params.sceneId);
  if (!chapter || chapter.acts.length === 0) {
    return null;
  }

  if (
    runtimeState &&
    runtimeState.chapterId === chapter.id &&
    chapter.acts.some((entry) => entry.id === runtimeState.currentActId)
  ) {
    return {
      ...runtimeState,
      completedActIds: [...toSet(runtimeState.completedActIds ?? [])],
      visitedActIds: [...toSet(runtimeState.visitedActIds ?? [])],
    };
  }

  const firstAct = chapter.acts[0]!;
  return {
    sceneId: chapter.sceneId,
    chapterId: chapter.id,
    currentActId: firstAct.id,
    currentActIndex: 0,
    completedActIds: [],
    visitedActIds: [firstAct.id],
  };
}

export function resolveActiveSceneActEncounterNpcIds(params: {
  profile: CustomWorldProfile | null | undefined;
  sceneId: string | null | undefined;
  storyEngineMemory?: StoryEngineMemoryState | null;
}) {
  const activeAct = resolveActiveSceneActBlueprint(params);
  if (!activeAct) {
    return [];
  }

  return resolveCustomWorldRoleIdReferences(params.profile, [
    activeAct.primaryNpcId,
    activeAct.oppositeNpcId,
    ...activeAct.encounterNpcIds,
  ]);
}

export function resolveActiveSceneActPrimaryNpcId(params: {
  profile: CustomWorldProfile | null | undefined;
  sceneId: string | null | undefined;
  storyEngineMemory?: StoryEngineMemoryState | null;
}) {
  return resolveCustomWorldRoleIdReferences(params.profile, [
    resolveActiveSceneActBlueprint(params)?.primaryNpcId,
  ])[0] ?? null;
}

export function resolveActiveSceneActOppositeNpcId(params: {
  profile: CustomWorldProfile | null | undefined;
  sceneId: string | null | undefined;
  storyEngineMemory?: StoryEngineMemoryState | null;
}) {
  return resolveCustomWorldRoleIdReferences(params.profile, [
    resolveActiveSceneActBlueprint(params)?.oppositeNpcId,
  ])[0] ?? null;
}

export function resolveActiveSceneActEncounterFocusNpcId(params: {
  profile: CustomWorldProfile | null | undefined;
  sceneId: string | null | undefined;
  storyEngineMemory?: StoryEngineMemoryState | null;
}) {
  const activeAct = resolveActiveSceneActBlueprint(params);
  return resolveCustomWorldRoleIdReferences(params.profile, [
    activeAct?.oppositeNpcId,
    activeAct?.primaryNpcId,
    activeAct?.encounterNpcIds[0],
  ])[0] ?? null;
}

export function resolveActiveSceneActBackgroundImage(params: {
  profile: CustomWorldProfile | null | undefined;
  sceneId: string | null | undefined;
  storyEngineMemory?: StoryEngineMemoryState | null;
}) {
  return resolveActiveSceneActBlueprint(params)?.backgroundImageSrc?.trim() || null;
}

export function canUseLimitedPrimaryNpcChat(params: {
  profile: CustomWorldProfile | null | undefined;
  sceneId: string | null | undefined;
  storyEngineMemory?: StoryEngineMemoryState | null;
  npcId: string | null | undefined;
  affinity: number;
}) {
  if (params.affinity >= 0 || !params.npcId) {
    return false;
  }

  const activeAct = resolveActiveSceneActBlueprint({
    profile: params.profile,
    sceneId: params.sceneId,
    storyEngineMemory: params.storyEngineMemory,
  });

  const limitedChatNpcIds = toSet(
    resolveCustomWorldRoleIdReferences(params.profile, [
      activeAct?.primaryNpcId,
      activeAct?.oppositeNpcId,
    ]),
  );
  const normalizedNpcId =
    resolveCustomWorldRoleIdReferences(params.profile, [params.npcId])[0] ??
    params.npcId;

  // 中文注释：第一幕对面角色即使是负好感，也必须先进入剧情对话；普通敌人仍按战斗处理。
  if (limitedChatNpcIds.has(normalizedNpcId)) {
    return true;
  }

  return (
    resolveActiveSceneActPrimaryNpcId({
      profile: params.profile,
      sceneId: params.sceneId,
      storyEngineMemory: params.storyEngineMemory,
    }) === normalizedNpcId
  );
}

export function resolveLimitedPrimaryNpcChatState(params: {
  state: Pick<GameState, 'customWorldProfile' | 'currentScenePreset' | 'storyEngineMemory'>;
  npcId: string | null | undefined;
  affinity: number;
  nextTurnCount: number;
}): NpcChatTurnDirective | null {
  if (
    !canUseLimitedPrimaryNpcChat({
      profile: params.state.customWorldProfile,
      sceneId: params.state.currentScenePreset?.id ?? null,
      storyEngineMemory: params.state.storyEngineMemory,
      npcId: params.npcId,
      affinity: params.affinity,
    })
  ) {
    return null;
  }

  const activeAct = resolveActiveSceneActBlueprint({
    profile: params.state.customWorldProfile,
    sceneId: params.state.currentScenePreset?.id ?? null,
    storyEngineMemory: params.state.storyEngineMemory,
  });
  return {
    sceneActId: activeAct?.id ?? null,
    turnLimit: null,
    remainingTurns: null,
    limitReason: 'negative_affinity' as const,
    closingMode: 'free' as const,
    forceExitAfterTurn: false,
    terminationMode: 'hostile_model' as const,
    isHostileChat: true,
  };
}

export function getSceneConnectionDirectionText(
  relativePosition: SceneConnectionInfo['relativePosition'],
) {
  switch (relativePosition) {
    case 'north':
      return '向北走';
    case 'south':
      return '向南走';
    case 'east':
      return '向东走';
    case 'west':
      return '向西走';
    case 'left':
      return '向左走';
    case 'right':
      return '向右走';
    case 'back':
      return '往回走';
    case 'up':
      return '向上走';
    case 'down':
      return '向下走';
    case 'inside':
      return '向内走';
    case 'outside':
      return '向外走';
    case 'portal':
      return '穿过通路';
    case 'forward':
    default:
      return '向前走';
  }
}